Emit .d.ts to dist/ on build via "declaration" in tsconfig.json (#323)

* Emit .d.ts to dist/ on build via "declaration" in tsconfig.json

* Bump version to 0.28

Co-authored-by: Kenneth Skovhus <skovhus@users.noreply.github.com>

Author: danbeam

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jest-codemods",
-  "version": "0.27.0",
+  "version": "0.28.0",
   "description": "Codemods for migrating test files to Jest",
   "license": "MIT",
   "repository": "skovhus/jest-codemods",

tsconfig.json

@@ -14,7 +14,8 @@
     "moduleResolution": "node",
     "resolveJsonModule": true,
     "downlevelIteration": true,
-    "outDir": "dist"
+    "outDir": "dist",
+    "declaration": true
   },
   "include": [
     "*.*",